Pumpkin Disease Types, Treatment and Prevention

Today I will tell you about several diseases of pumpkin and how to prevent them.

1. Vine blight

1. Rotate crops with non-melon crops for 2-3 years;

2. Mix seeds with 2.5% Celex suspension concentrate: 2-4 ml Celex per kilogram of seeds. Refer to Section 4 for the method of treating wax gourd wilt.

3. Cultivate on high ridges, cover with plastic film, and drain water during the rainy season;

4. To prevent vine blight, 1500 times dilution of 25% Amicida suspension can be used. The method is the same as that in Section 2 for preventing and controlling winter melon blight.

5. The key point of prevention and control during the growth period is to grasp the initial onset of the disease center. Systemic therapeutic fungicides should be used, such as 10% Shigao water-dispersible granules 1500 times diluted, spray once every 7-10 days, and continuously 2-3 times. When dispensing the medicine, the medicine must be opened into a mother solution first, and then poured into the sprayer to make the concentration of the liquid uniform. It can be used alternately with 40% Miebingwei glue suspension 500 times diluted, or 21.2% Jiashourebi wettable powder 1000 times diluted, Baike emulsifiable concentrate 2000 times diluted, 50% carbendazim wettable powder 500 times diluted, and 25% Dilito emulsifiable concentrate 1500 times diluted, once every 7-10 days, and read 2-3 times in a row. It can also be mixed with 40% Miebingwei glue suspension 500 times diluted and 50% carbendazim wettable powder 500 times diluted to flour the stems.

2. Liriomyza sativae

1. Thoroughly remove the plant residues after harvest, and burn, bury or compost them;

2. Thin out branches and leaves appropriately, and remove leaves with many insect tunnels in the middle and lower parts to reduce the insect population base;

3. Set up "fly paper" in the field; during the peak period of adult insects, hang "fly paper" on the bamboo fence at 2/3 of the plant height (if it is the peak flowering period, artificial pollination should be strengthened), 15-20 points per mu, and change it every 15 days, which can kill the adult insects and reduce the insect population density;

4. Chemical control: Spray pesticides during the peak period of larvae. You can spray 3000 times of 1.8% Aifodine EC, 1000 times of 1.8% Aifodine EC, 1000 times of 40.7% Lorsban EC, 1200-1500 times of 90% Badan WP, 800 times of 90% Cypermethrin WP, and use them alternately, once every 7-10 days, for 2-3 times in a row.

3. Powdery mildew

The pathogen belongs to the subphylum Ascomycota, Powdery mildew and Aspergillus cucurbitae. It begins to occur in early June. The disease overwinters or oversummers on the host with hyphae or conidia, becoming the source of infection in the early next year. Conidia are spread by air currents or rain and fall on the host leaves. The germ tubes and haustoria at the tip of the conidia invade from the leaf epidermis. The mycelium adheres to the leaf surface. It takes 24 hours from germination to invasion. After 5 days, white hyphae clusters form at the infection site. After 7 days, they mature into conidia and re-infect. Whether powdery mildew can spread depends on humidity and the growth of the host. Generally, high humidity is conducive to its spread.

Prevention and control methods: In the early stage of the disease, spray 1500 times of 15% triadimefon wettable powder or 500-600 times of polysulfide suspension. Technical points: early prevention, prevention before noon, thorough spraying and large amount of water. Smoke method can be adopted in protected areas, such as sulfur powder fumigation or 45% chlorothalonil fumigation.